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MAINTENANCE INSTRUCTIONS
MAINTENANCE
FAULT
CAUSE
MEASURES
Message on the user interface:
Extract fan stopped
The extract air fan has stopped.
Make sure that the fan is not running. The fan cabling
and operation must be checked, and if necessary the
fan must be replaced. Contact the service centre.
Message on the user interface:
Supply fan stopped
The supply air fan has stopped.
Make sure that the fan is not running. The fan cabling
and operation must be checked, and if necessary the
fan must be replaced. Contact the service centre.
Message on the user interface:
Cell has frozen
The heat recovery cell has
become excessively cold.
Conduct a manual defrost through the control panel
(Service menu > Cell defrost). Try to discover why the
heat recovery cell is frozen.
Message on the user interface:
Temperature sensor 1/2/3/4/5
The temperature sensor indicated
on the user interface is damaged.
The sensor installation must be checked, and if
required the sensor must be replaced. Contact the
service centre.
Message on the user interface:
External sensor
The external temperature sensor is
damaged.
The sensor installation must be checked, and if
required the sensor must be replaced. Contact the
service centre.
Message on the user interface:
Post-heater
The post-heater does not heat
The heater installation must be checked, and if
required the heater must be replaced. Contact the
service centre.
Message on the user interface:
Bus fault
Problems with the data transfer
bus.
Make sure that the Modbus bus is connected
correctly, and that the devices connected to it are
properly functioning.
The ventilation unit is not
working; the control panel is
not working.
Power input to the unit is lost
Check:
• Fuse in the fusebox
• Fuse in the unit
The ventilation unit is working,
but the control panel is not
working.
Either the control panel 24 VDC
power is lost, or the control panel
is damaged.
Check the cables from the unit to the control panel.
Contact the service centre if necessary.
CONDENSING WATER
In the heating season, the extract air humidity condenses to
water. In new buildings, condensation runoff can form rapidly.
Condensed water must be able to freely leave the unit. At some
time before the heating season begins (e.g. during autumn
maintenance), check that the condensing water outlets in the
bottom pool are not clogged and that there are no leakages.
To check this, pour some water into the pool. Clean as required.
Check where the condensing water outlets are in the Installation
section.
TROUBLESHOOTING
The table below contains troubleshooting and fault repair
instructions.
NOTE
Some condensing water may
have accumulated in the bottom
pool of the unit; this is normal and
requires no corrective action.
WARNING
Water must at all times be kept out
of the electrical system.